NV C-1A Boilers Practice Questions - Nevada C-1A Boilers Contractor Examination Exam

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When all combustion air comes from outdoors through two openings that communicate directly or through vertical ducts, each opening shall have a free area of not less than which ratio?

1 square inch per 1,000 Btu/h 1 square inch per 2,000 Btu/h 1 square inch per 3,000 Btu/h 1 square inch per 4,000 Btu/h

Correct Answer:

1 square inch per 4,000 Btu/h

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